Cited by 355Nutrition and Health in AgingBody Composition Measurement TechniquesMuscle Physiology and Disorders

Sarcopenic obesity in older adults: a clinical overview

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Prado, Carla M., Batsis, John A., Donini, Lorenzo M., Gonzalez, M. Cristina, Siervo, Mario·2024·Nature Reviews Endocrinology

Abstract

Sarcopenic obesity is characterized by a concurrent decline in muscle mass and function, along with increased adipose tissue. Sarcopenic obesity is a growing concern in older adults owing to significant health consequences, including implications for mortality, comorbidities and risk of developing geriatric syndromes. A 2022 consensus statement established a new definition and diagnostic criteria for sarcopenic obesity. The pathophysiology of this condition involves a complex interplay between muscle, adipose tissue, hormonal changes, inflammation, oxidative stress and lifestyle factors, among others. Sarcopenic obesity is treated with a range of management approaches, such as lifestyle interventions, exercise, nutrition and medical therapies. Emerging therapies that were developed for treating other conditions may be relevant to sarcopenic obesity, including novel pharmacological agents and personalized approaches such as precision medicine. In this Review, we synthesize the current knowledge of the clinical importance of sarcopenic obesity, its assessment and diagnosis, along with current and emerging management strategies.

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Crossref · 10.1038/s41574-023-00943-z

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  • Premisecitation

    The pathophysiology of sarcopenic obesity involves complex interactions among muscle, adipose tissue, hormonal changes, inflammation, oxidative stress, and lifestyle factors.

    “The pathophysiology of this condition involves a complex interplay between muscle, adipose tissue, hormonal changes, inflammation, oxidative stress and lifestyle factors, among others.”
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    • cites [47] JafariNasabian, P., Inglis, J. E., Reilly, W., Kelly, O. J. & Ilich, J. Z. Aging human body: changes in bone, muscle and body fat with consequent changes in nutrient intake. J. Endocrinol. 234, R37–R51 (2017). source

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    • cites [48] Sakuma, K. & Yamaguchi, A. Sarcopenic obesity and endocrinal adaptation with age. Int. J. Endocrinol. 2013, 204164 (2013). source

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    • cites [50] Gonzalez, A. et al. The critical role of oxidative stress in sarcopenic obesity. Oxid. Med. Cell Longev. 2021, 4493817 (2021). source

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    • cites [51] Huo, F., Liu, Q. & Liu, H. Contribution of muscle satellite cells to sarcopenia. Front. Physiol. 13, 892749 (2022). source

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  • Premisecitation

    Sarcopenic obesity is a growing concern in older adults because of significant health consequences, including mortality, comorbidities, and risk of geriatric syndromes.

    “Sarcopenic obesity is a growing concern in older adults owing to significant health consequences, including implications for mortality, comorbidities and risk of developing geriatric syndromes.”
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    • cites 21–46

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    Hormonal shifts associated with ageing and obesity strongly influence the pathophysiology of sarcopenic obesity.

    “Hormonal shifts associated with ageing and obesity strongly influence the pathophysiology of sarcopenic obesity48.”
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    • cites [48] Sakuma, K. & Yamaguchi, A. Sarcopenic obesity and endocrinal adaptation with age. Int. J. Endocrinol. 2013, 204164 (2013). source

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    Ageing increases infiltration of skeletal muscle by adipose tissue (myosteatosis) in multiple depots, including intermuscular adipose tissue and intramyocellular lipids.

    “With ageing, there is an increase in infiltration of skeletal muscle by adipose tissue (termed myosteatosis) within multiple different adipose depots, including intermuscular adipose tissue and intramyocellular lipids55.”
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    • cites [55] Correa-de-Araujo, R. et al. Myosteatosis in the context of skeletal muscle function deficit: an Interdisciplinary Workshop at the National Institute on Aging. Front. Physiol. 11, 963 (2020). This workshop discusses the impact of myosteatosis on skeletal muscle function during aging, detailing its connection to metabolic disease, evaluation techniques and prospective interventions, and emphasizing the importance of innovative research domains and interdisciplinary synergy. source

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    Ageing leads to a gradual decline in the proportion of fast-twitch (type II) muscle fibres, which may contribute to decreased muscle strength and power.

    “The ageing process leads to a gradual decline in the proportion of fast-twitch (type II) muscle fibres, which may contribute to decreased muscle strength and power56.”
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    • cites [56] Larsson, L. et al. Sarcopenia: aging-related loss of muscle mass and function. Physiol. Rev. 99, 427–511 (2019). source

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    Findingcitation

    Sarcopenic obesity has considerable clinical impact, linked to high risk of death, comorbidities, metabolic disorders, and geriatric syndromes including frailty.

    “These data demonstrate that sarcopenic obesity has a considerable clinical impact, as it is linked to a high risk of death, comorbidities, metabolic disorders and geriatric syndromes, including frailty.”
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    • cites 21–46

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    A 2022 consensus statement established a new definition and diagnostic criteria for sarcopenic obesity.

    “A 2022 consensus statement established a new definition and diagnostic criteria for sarcopenic obesity.”
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    • cites [2] Donini, L. M. et al. Definition and diagnostic criteria for sarcopenic obesity: ESPEN and EASO consensus statement. Clin. Nutr. 41, 990–1000 (2022). Collaboration between ESPEN and EASO has established a unified definition and diagnostic criteria for sarcopenic obesity, aiming to streamline research and treatment approaches for this prevalent condition. source

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    • cites [3] Donini, L. M. et al. Definition and diagnostic criteria for sarcopenic obesity: ESPEN and EASO consensus statement. Obes. Facts 15, 321–335 (2022). source

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    Ageing is associated with increased adipose tissue mass and visceral distribution, attributed to hormonal changes, low muscle mass, low physical activity, unfavourable metabolism, and lifestyle factors.

    “Ageing is associated with an increase in adipose tissue mass and distribution (that is, an increase in visceral adipose tissue), which can be attributed to various factors such as hormonal changes, low muscle mass, low physical activity, unfavourable changes in metabolism and lifestyle factors47.”
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    • cites [47] JafariNasabian, P., Inglis, J. E., Reilly, W., Kelly, O. J. & Ilich, J. Z. Aging human body: changes in bone, muscle and body fat with consequent changes in nutrient intake. J. Endocrinol. 234, R37–R51 (2017). source

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    Precipitating events such as falls, hip fractures, stroke, or other illnesses can impair mobility and trigger acute-phase responses, leading to body composition changes.

    “In addition, changes in body composition may result from precipitating events, such as falls, hip fractures, stroke or other illnesses, all of which temporarily or permanently impair mobility, and are accompanied by acute-phase responses15.”
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    • cites [15] Baumgartner, R. N. & Waters, D. L. in Principles and Practice of Geriatric Medicine (eds Pathy, M. S. J., Sinclair, A. J. & Morley, J. E.) 909–933 (Wiley, 2005). source

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    Premisecitation

    Not all older adults with obesity have sarcopenia because excess body weight usually stimulates muscle and bone mechanoreceptors, triggering growth factor synthesis and muscle formation.

    “Of note, not all older adults with obesity will exhibit sarcopenia, as excess body weight usually stimulates muscle (and bone) mechanoreceptors, triggering growth factor synthesis that leads to muscle formation11.”
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    • cites [11] Stenholm, S. et al. Sarcopenic obesity: definition, cause and consequences. Curr. Opin. Clin. Nutr. Metab. Care 11, 693–700 (2008). source

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    Sarcopenic obesity was first defined in 1996 as simultaneous excess adipose tissue and reduced muscle mass.

    “Sarcopenic obesity was first defined in 1996 (ref. 1) as a syndrome characterized by the simultaneous presence of excess adipose tissue and reduced muscle mass.”
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    • cites [1] Heber, D. et al. Clinical detection of sarcopenic obesity by bioelectrical impedance analysis. Am. J. Clin. Nutr. 64, 472s–477s (1996). source

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    Premisecitation

    Oxidative stress adversely affects muscle health through protein breakdown, inflammation, impaired regeneration, mitochondrial dysfunction, and insulin resistance.

    “Oxidative stress adversely impacts muscle health through muscle protein breakdown60, muscle inflammation61, impaired muscle regeneration62, mitochondrial dysfunction63 and insulin resistance50.”
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    • cites [50] Gonzalez, A. et al. The critical role of oxidative stress in sarcopenic obesity. Oxid. Med. Cell Longev. 2021, 4493817 (2021). source

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    • cites [60] Powers, S. K., Smuder, A. J. & Criswell, D. S. Mechanistic links between oxidative stress and disuse muscle atrophy. Antioxid. Redox Signal. 15, 2519–2528 (2011). source

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    Premisecitation

    Weight gain or weight loss can contribute to the development of sarcopenic obesity.

    “Various metabolic scenarios, such as weight gain or loss, can contribute to the development of sarcopenic obesity.”
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    • cites [14] Prado, C. M. M., Wells, J. C. K., Smith, S. R., Stephan, B. C. M. & Siervo, M. Sarcopenic obesity: a critical appraisal of the current evidence. Clin. Nutr. 31, 583–601 (2012). This review highlights the significance of sarcopenic obesity due to its dual metabolic burden, and underscores the inconsistency in study methodologies. source

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    In population-representative US data, sarcopenic obesity prevalence was 28.3% in people over 60 years, and 66.6% in Mexican Americans.

    “Population-representative data for the USA demonstrated a prevalence of sarcopenic obesity of 28.3% in people >60 years of age, with a higher prevalence of 66.6% in Mexican Americans7.”
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    • cites [7] Murdock, D. J. et al. The prevalence of low muscle mass associated with obesity in the USA. Skelet. Muscle 12, 26 (2022). source

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    Premisecitation

    Ageing is associated with increased oxidative damage to muscle cells, and oxidative stress is a key factor in development and progression of sarcopenia.

    “Ageing is associated with an increase in oxidative damage to muscle cells, with oxidative stress identified as a key factor in the development and progression of sarcopenia59.”
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    • cites [59] Meng, S. J. & Yu, L. J. Oxidative stress, molecular inflammation and sarcopenia. Int. J. Mol. Sci. 11, 1509–1526 (2010). source

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    Premisecitation

    Weight gain can increase adipose cell size, promoting immune cell recruitment and secretion of inflammatory factors such as IL-6, CRP, and TNF, creating low-grade chronic inflammation that can impair insulin sensitivity.

    “Weight gain can result in an increase in adipose cell size, which may promote the recruitment of immune cells and secretion of inflammatory factors within adipose tissue, such as IL-6, C-reactive protein and tumour necrosis factor, creating a state of low-grade chronic inflammation that can impair insulin sensitivity57.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [57] Kawai, T., Autieri, M. V. & Scalia, R. Adipose tissue inflammation and metabolic dysfunction in obesity. Am. J. Physiol. Cell Physiol. 320, C375–C391 (2021). source

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    Premisecitation

    Myostatin is upregulated in sarcopenia, while irisin appears downregulated.

    “Production of myostatin, a growth-inhibiting myokine, is upregulated in sarcopenia64, whereas that of muscle-mass-stimulating irisin seems to be downregulated65.”
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    • cites [64] White, T. A. & LeBrasseur, N. K. Myostatin and sarcopenia: opportunities and challenges – a mini-review. Gerontology 60, 289–293 (2014). source

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    • cites [65] Chang, J. S. et al. Circulating irisin levels as a predictive biomarker for sarcopenia: a cross-sectional community-based study. Geriatr. Gerontol. Int. 17, 2266–2273 (2017). source

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    Premisecitation

    The definition of sarcopenic obesity has evolved to include reduced muscle function, with muscle strength as the predominant measure.

    “However, the definition has evolved to also incorporate reduced muscle function in the diagnosis of sarcopenia in older adults2,3, with muscle strength being the predominant measure of function.”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites [2] Donini, L. M. et al. Definition and diagnostic criteria for sarcopenic obesity: ESPEN and EASO consensus statement. Clin. Nutr. 41, 990–1000 (2022). Collaboration between ESPEN and EASO has established a unified definition and diagnostic criteria for sarcopenic obesity, aiming to streamline research and treatment approaches for this prevalent condition. source

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    • cites [3] Donini, L. M. et al. Definition and diagnostic criteria for sarcopenic obesity: ESPEN and EASO consensus statement. Obes. Facts 15, 321–335 (2022). source

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    Interpretationnone given

    Emerging therapies developed for other conditions may be relevant to sarcopenic obesity, including novel pharmacological agents and precision medicine.

    “Emerging therapies that were developed for treating other conditions may be relevant to sarcopenic obesity, including novel pharmacological agents and personalized approaches such as precision medicine.”
    Quote in the paperNot a substantial claim
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    Premisecitation

    Ageing-associated decline in testosterone and oestrogen weakens muscle, reducing mass and strength.

    “Ageing-associated decline in testosterone and oestrogen levels weakens muscle, reducing both muscle mass and strength66.”
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    • cites [66] Gupta, P. & Kumar, S. Sarcopenia and endocrine ageing: are they related? Cureus 14, e28787 (2022).

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    Sarcopenic obesity represents the intersection of ageing populations and the obesity epidemic.

    “Sarcopenic obesity exemplifies the intersection of two prevalent health crises: ageing populations and the obesity epidemic4.”
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    • cites [4] Roubenoff, R. Sarcopenic obesity: the confluence of two epidemics. Obes. Res. 12, 887–888 (2004). This commentary discusses how the convergence of the obesity epidemic with an ageing population magnifies the risk of sarcopenic obesity, posing unprecedented health challenges and underscoring the urgent need for interdisciplinary collaboration. source

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    Premisecitation

    Decreased anabolic hormones (growth hormone, IGF1, testosterone) contribute to muscle loss and hindered protein synthesis.

    “Decreased levels of anabolic hormones, such as growth hormone, insulin-like growth factor 1 (IGF1) and testosterone, contribute to muscle loss and hindered protein synthesis48.”
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    • cites [48] Sakuma, K. & Yamaguchi, A. Sarcopenic obesity and endocrinal adaptation with age. Int. J. Endocrinol. 2013, 204164 (2013). source

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    Premisecitation

    NO modulates insulin signalling in muscle cells, while obesity and metabolic syndrome are associated with decreased whole-body NO synthesis.

    “NO modulates insulin signalling pathways in muscle cells80, while obesity and metabolic syndrome are associated with decreased whole-body NO synthesis81.”
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    • cites [80] Bergandi, L. et al. Insulin stimulates glucose transport via nitric oxide/cyclic GMP pathway in human vascular smooth muscle cells. Arterioscler. Thromb. Vasc. Biol. 23, 2215–2221 (2003). source

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    Premisecitation

    Ageing is related to decline in nitric oxide production and skeletal muscle blood flow.

    “Ageing has also been related to a decline in nitric oxide (NO) production76 and skeletal muscle blood flow77.”
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    • cites [76] Sverdlov, A. L., Ngo, D. T. M., Chan, W. P. A., Chirkov, Y. Y. & Horowitz, J. D. Aging of the nitric oxide system: are we as old as our NO? J. Am. Heart Assoc. 3, e000973 (2014). source

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    Premisecitation

    NO and insulin are crucial for muscle metabolism and implicated in sarcopenia development and progression.

    “NO and insulin are crucial for muscle metabolism and are implicated in the development and progression of sarcopenia78,79.”
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    • cites [78] Cleasby, M. E., Jamieson, P. M. & Atherton, P. J. Insulin resistance and sarcopenia: mechanistic links between common co-morbidities. J. Endocrinol. 229, R67–R81 (2016). source

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    Premisecitation

    Older adults may be at high risk of low protein intake and inadequate essential amino acid consumption.

    “For example, older adults might be at high risk of a low protein intake and inadequate consumption of essential amino acids89.”
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    • cites [89] Deutz, N. E. et al. Protein intake and exercise for optimal muscle function with aging: recommendations from the ESPEN Expert Group. Clin. Nutr. 33, 929–936 (2014). This expert opinion highlights the importance of maintaining muscle function during ageing through adequate protein intake (1.0–1.2 g/kg body weight daily for healthy older adults and 1.2–1.5 g/kg daily for malnourished adults or those facing illness) and daily physical activity or exercise for sustained muscle health. source

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    Interpretationreasoning

    Not only the amount but also the source of protein may be crucial for preserving muscle mass.

    “As such, not only the amount of protein but also the source of protein might be crucial for preserving muscle mass.”
    Quote in the paperSubstantial claim
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    Premisecitation

    Increased cortisol promotes protein breakdown and inhibits protein synthesis, exacerbating muscle wasting and sarcopenia.

    “Concurrently, increased levels of catabolic hormones, such as cortisol, promote protein breakdown and inhibit protein synthesis, exacerbating muscle wasting and sarcopenia67.”
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    • cites [67] Braun, T. P. & Marks, D. L. The regulation of muscle mass by endogenous glucocorticoids. Front. Physiol. 6, 12 (2015). source

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    Premisecitation

    Chronic stress can lead to overeating and sedentary lifestyle, increasing sarcopenia risk.

    “Chronic stress can lead to overeating and/or a sedentary lifestyle67,72, factors that may increase the risk of sarcopenia.”
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    • cites [67] Braun, T. P. & Marks, D. L. The regulation of muscle mass by endogenous glucocorticoids. Front. Physiol. 6, 12 (2015). source

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    • cites [72] van Rossum, E. F. C. Obesity and cortisol: new perspectives on an old theme. Obesity 25, 500–501 (2017). source

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    Premisecitation

    Chronic stress and high cortisol can negatively impact muscle tissue and increase sarcopenia risk.

    “Chronic stress and consistently high cortisol levels can negatively impact muscle tissue and increase sarcopenia risk68.”
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    • cites [68] Yanagita, I. et al. A high serum cortisol/DHEA-S ratio is a risk factor for sarcopenia in elderly diabetic patients. J. Endocr. Soc. 3, 801–813 (2019). source

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    Premisecitation

    Cortisol can negatively affect bone health and exacerbate age-related bone density decline, possibly contributing to osteosarcopenic obesity.

    “Furthermore, cortisol can negatively affect bone health73 and exacerbate age-related bone density decline, possibly contributing to the development of osteosarcopenic obesity74.”
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    • cites [73] Chiodini, I., Torlontano, M., Carnevale, V., Trischitta, V. & Scillitani, A. Skeletal involvement in adult patients with endogenous hypercortisolism. J. Endocrinol. Invest. 31, 267–276 (2008). source

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    Premisecitation

    NO and insulin regulate mitochondrial function by enhancing mitochondrial respiration and biogenesis, and insulin stimulates cellular glucose uptake and utilization in mitochondria.

    “Both NO and insulin have crucial roles in regulating mitochondrial function by enhancing mitochondrial respiration and promoting mitochondrial biogenesis, whereas insulin stimulates cellular glucose uptake and its subsequent utilization within the mitochondria85.”
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    • cites [85] Tengan, C. H., Rodrigues, G. S. & Godinho, R. O. Nitric oxide in skeletal muscle: role on mitochondrial biogenesis and function. Int. J. Mol. Sci. 13, 17160–17184 (2012). The review discusses the physiological roles of nitric oxide in mitochondrial energetics and skeletal muscle function. source

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    Premisecitation

    Higher protein intake is particularly important in older adults at higher risk of anabolic resistance.

    “Importantly, a higher protein intake is particularly important in older adults who are at higher risk of anabolic resistance174,175.”
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    • cites [174] Burd, N. A., Gorissen, S. H. & van Loon, L. J. C. Anabolic resistance of muscle protein synthesis with aging. Exerc. Sport. Sci. Rev. 41, 169–173 (2013). source

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    Premisecitation

    Food insecurity has been proposed as a risk factor for sarcopenic obesity, associated with poor diet quality, nutritional deficiencies, physical inactivity, and unfavourable metabolic changes.

    “Food insecurity has also been proposed as a risk factor in developing sarcopenic obesity91, as it may be associated with poor diet quality, nutritional deficiencies, physical inactivity and unfavourable metabolic changes.”
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    • cites [91] Fonseca-Pérez, D., Arteaga-Pazmiño, C., Maza-Moscoso, C. P., Flores-Madrid, S. & Álvarez-Córdova, L. Food insecurity as a risk factor of sarcopenic obesity in older adults. Front. Nutr. 9, 1040089 (2022). source

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    Premisecitation

    NO-mediated vasodilation can enhance blood flow and nutrient delivery to muscles, supporting muscle metabolism and potentially mitigating sarcopenia.

    “NO-mediated vasodilation can enhance blood flow and nutrient delivery to muscles, supporting muscle metabolism and potentially mitigating sarcopenia84.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [84] Wagenmakers, A. J., Strauss, J. A., Shepherd, S. O., Keske, M. A. & Cocks, M. Increased muscle blood supply and transendothelial nutrient and insulin transport induced by food intake and exercise: effect of obesity and ageing. J. Physiol. 594, 2207–2222 (2016). source

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    Premisecitation

    High cortisol may link to muscle loss via mTOR inhibition, suppression of IGF1 and testosterone anabolic effects, and activation of ubiquitin-proteasome system.

    “Mechanisms that might link high cortisol levels to the loss of muscle mass include inhibition of the mammalian target of rapamycin (mTOR) pathway69, suppression of the anabolic effects of IGF1 (ref. 69) and testosterone70, and activation of the ubiquitin–proteasome system in skeletal muscle71.”
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    • cites [69] Shimizu, N. et al. Crosstalk between glucocorticoid receptor and nutritional sensor mTOR in skeletal muscle. Cell Metab. 13, 170–182 (2011). source

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    • cites [70] Brownlee, K. K., Moore, A. W. & Hackney, A. C. Relationship between circulating cortisol and testosterone: influence of physical exercise. J. Sports Sci. Med. 4, 76–83 (2005).

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    Premisecitation

    The SURPASS-1 trial demonstrated improvements in HbA1c that were lower in older adults than in younger individuals and not dose-dependent.

    “The SURPASS-1 trial demonstrated improvements in HbA1c that were lower in older adults than in younger individuals and not dose-dependent210”
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    • cites [210] Rosenstock, J. et al. Efficacy and safety of a novel dual GIP and GLP-1 receptor agonist tirzepatide in patients with type 2 diabetes (SURPASS-1): a double-blind, randomised, phase 3 trial. Lancet 398, 143–155 (2021). source

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    Premisereasoning

    Few studies have evaluated the impact of bariatric surgery on sarcopenic obesity, as most focused solely on postsurgical musculoskeletal health.

    “Few studies have evaluated the impact of bariatric surgery on sarcopenic obesity, as most studies focused solely on postsurgical evaluation of musculoskeletal health.”
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    Premisecitation

    In a study of 80 women with obesity assigned to Roux-en-Y bypass with or without exercise, there were no differences in phenotypic and genotypic characteristics between groups.

    “A separate study in 80 women with obesity assigned to Roux-en-Y bypass with or without exercise found no differences in the phenotypic and genotypic characteristics between groups193.”
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    • cites [193] Gil, S. et al. A randomized clinical trial on the effects of exercise on muscle remodelling following bariatric surgery. J. Cachexia Sarcopenia Muscle 12, 1440–1455 (2021). source

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  • May combine two claims.

    Interpretationreasoning

    The combination of nutrition and exercise may substantially reduce adiposity while increasing muscle mass and physical function, sometimes without BMI change.

    “Nevertheless, based on the available evidence, physiologically the combination of nutrition and exercise may substantially reduce adiposity with concomitant increase in muscle mass (in some cases without any BMI variation) and physical function (for example, handgrip strength and gait speed).”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisecitation

    Use of newer anti-obesity medications may lead to substantial weight loss with improvements in comorbidities and reductions in heart failure risk.

    “While the use of newer medications may lead to substantial weight loss, with resultant improvements in comorbidities and reductions in risk of heart failure212, obtaining a solid understanding of the long-term consequences of these interventions is of the utmost importance, particularly in older adults.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [212] Harris, E. Semaglutide improves heart failure and cardiovascular disease. JAMA 330, 1127–1127 (2023).

      Not checked in the free run.

  • May combine two claims.

    Premisenone given

    These anti-obesity medications have not been specifically tested in populations with sarcopenic obesity, and trials have restricted older adults and individuals with chronic diseases.

    “These AOMs have not been specifically tested in populations with sarcopenic obesity and, furthermore, clinical trials have both restricted the number of older adults enrolled in their studies and limited the number of individuals with chronic diseases.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisenone given

    In tirzepatide trials, body composition was not assessed and there were no objective measurements of physical function.

    “Crucially, body composition was not assessed, and in all such trials there have been no objective measurements of physical function.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisecitation

    SARMs indirectly affect non-muscle androgen receptor pathways mediated by muscle fibroblasts and, in some but not all studies, have been shown to increase muscle mass and physical function.

    “SARMs indirectly affect non-muscle androgen receptor pathways mediated by muscle fibroblasts and, in some but not all studies have been shown to increase muscle mass and physical function216.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [216] Bhasin, S., Krishnan, V., Storer, T. W., Steiner, M. & Dobs, A. S. Androgens and selective androgen receptor modulators to treat functional limitations associated with aging and chronic disease. J. Gerontol. A Biol. Sci. Med. Sci. 78, 25–31 (2023). source

      Not checked in the free run.

  • May combine two claims.

    Interpretationreasoning

    When combined with growth hormone, testosterone supplementation can mitigate negative effects of obesity and ageing by promoting IGF1 mRNA and protein expression and increasing muscle protein synthesis, muscle mass, and function, particularly with exercise.

    “When combined with growth hormone, testosterone supplementation can mitigate the negative effects of obesity (increasing diet-induced adipose tissue loss) and of the ageing process, by promoting IGF1 mRNA and protein expression, and increasing muscle protein synthesis, and muscle mass and function, particularly when combined with exercise intervention.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisecitation

    Time-restrictive eating can lead to weight loss without substantial muscle loss and is associated with improvements in cardiovascular function and other physiological markers.

    “This dietary approach can lead to weight loss without substantial loss of muscle mass and is associated with improvements in cardiovascular function and other physiological markers188–190.”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites [188] Kirkham, A. A. et al. Implementation of weekday time-restricted eating to improve metabolic health in breast cancer survivors with overweight/obesity. Obesity 31, 150–160 (2023). source

      Not checked in the free run.

    • cites [189] Kirkham, A. A., Parr, E. B. & Kleckner, A. S. Cardiometabolic health impacts of time-restricted eating: implications for type 2 diabetes, cancer and cardiovascular diseases. Curr. Opin. Clin. Nutr. Metab. Care 25, 378–387 (2022). source

      Not checked in the free run.

    • cites [190] Martens, C. R. et al. Short-term time-restricted feeding is safe and feasible in non-obese healthy midlife and older adults. Geroscience 42, 667–686 (2020). source

      Not checked in the free run.

  • May combine two claims.

    Premisenone given

    Studies of anamorelin are highly heterogeneous; treatment improved lean mass but failed to improve muscle function in different trials.

    “Studies investigating anamorelin are characterized by high heterogeneity; however, treatment with this hormone analogue improved lean mass but failed to improve muscle function in different trials.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Premisereasoning

    The proportion of muscle mass loss relative to adipose tissue and the degree of resolution of myosteatosis and ectopic adipose tissue deposition with semaglutide and tirzepatide remain unclear.

    “However, the proportion of muscle mass loss (relative to adipose tissue) and the degree of resolution of myosteatosis and ectopic adipose tissue deposition (that is, improvement in muscle composition) remain unclear.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisenone given

    Data on testosterone supplementation are conflicting: some trials found no significant effects on muscle health, while others found no impact on physical function.

    “Nonetheless, the data are conflicting: some trials found no significant effects of testosterone supplementation on muscle health, while others found there was no impact on physical function.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Premisecitation

    Anamorelin, an oral ghrelin analogue, has mostly been studied in cancer and has anti-inflammatory and anabolic properties.

    “This oral ghrelin analogue has mostly been studied in cancer217–219 and has anti-inflammatory and anabolic properties.”
    Quote in the paperNot a substantial claim0 of 3 sources checked
    • cites [217] Currow, D. C., Maddocks, M., Cella, D. & Muscaritoli, M. Efficacy of anamorelin, a novel non-peptide ghrelin analogue, in patients with advanced non-small cell lung cancer (NSCLC) and cachexia – review and expert opinion. Int. J. Mol. Sci. 19, 3471 (2018). source

      Not checked in the free run.

    • cites [218] Fonseca, G. W. P. D. & von Haehling, S. An overview of anamorelin as a treatment option for cancer-associated anorexia and cachexia. Expert. Opin. Pharmacother. 22, 889–895 (2021). source

      Not checked in the free run.

    • cites [219] Wakabayashi, H., Arai, H. & Inui, A. Anamorelin in Japanese patients with cancer cachexia: an update. Curr. Opin. Support. Palliat. Care 17, 162–167 (2023). source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Ageing leads to testosterone deficiency that may impair muscle adaptation to exercise, as reduced muscle mass and IGF1 expression can increase pro-inflammatory cytokines.

    “Ageing leads to testosterone deficiency that may impair muscle adaptation to exercise, as reduced muscle mass and IGF1 expression can increase pro-inflammatory cytokines213.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [213] Pataky, M. W., Young, W. F. & Nair, K. S. Hormonal and metabolic changes of aging and the influence of lifestyle modifications. Mayo Clin. Proc. 96, 788–814 (2021). source

      Not checked in the free run.

  • May combine two claims.

    Premisenone given

    Studies of anamorelin in patients with sarcopenic obesity have not been conducted, and it is unclear whether observed lean mass improvements have differential effects across patient populations.

    “Studies in patients with sarcopenic obesity have not been conducted, and it is unclear whether the improvements in lean mass observed have differential effects in different patient populations.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Interpretationreasoning

    The lack of association between muscle mass and function can be related to how muscle mass was assessed (quantity only versus quantity and composition) or to other factors besides muscle mass.

    “This lack of association can be related to how muscle mass was assessed (that is, quantity only versus quantity and composition), or to other factors associated with muscle function besides muscle mass.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisecitation

    Mixed findings have been observed for strength measures after bariatric surgery, while improvements in physical function measures such as walking speed and sit-to-stand tests are more consistent.

    “Mixed findings have been observed in strength measures, while more consistent improvements have been found in physical function measures, including walking speed and sit-to-stand tests193,195,196.”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites [193] Gil, S. et al. A randomized clinical trial on the effects of exercise on muscle remodelling following bariatric surgery. J. Cachexia Sarcopenia Muscle 12, 1440–1455 (2021). source

      Not checked in the free run.

    • cites [195] Alba, D. L. et al. Changes in lean mass, absolute and relative muscle strength, and physical performance after gastric bypass surgery. J. Clin. Endocrinol. Metab. 104, 711–720 (2019). source

      Not checked in the free run.

    • cites [196] Reinmann, A. et al. Bariatric surgery: consequences on functional capacities in patients with obesity. Front. Endocrinol. 12, 646283 (2021). source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Myostatin can be modulated by diet.

    “Interestingly, myostatin can be modulated by diet221.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [221] Perry, C. A., Van Guilder, G. P. & Butterick, T. A. Decreased myostatin in response to a controlled DASH diet is associated with improved body composition and cardiometabolic biomarkers in older adults: results from a controlled-feeding diet intervention study. BMC Nutr. 8, 24 (2022). source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    In mice fed a high-fat diet, injection of umbilical cord MSCs led to improvements in physical function and mitigated obesity-related muscle atrophy.

    “In mice fed a high-fat diet, injection of umbilical cord MSCs led to improvements in physical function and mitigated obesity-related muscle atrophy225.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [225] Song, J. et al. Mesenchymal stromal cells ameliorate diabetes-induced muscle atrophy through exosomes by enhancing AMPK/ULK1-mediated autophagy. J. Cachexia Sarcopenia Muscle 14, 915–929 (2023). source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Inhibition of myostatin leads to muscle cell hyperplasia and hypertrophy, suppresses irisin, downregulates pro-inflammatory cytokines, and may have beneficial effects on metabolism, adiposity, and insulin sensitivity.

    “While inhibition of myostatin leads to muscle cell hyperplasia and hypertrophy, suppresses irisin and downregulates pro-inflammatory cytokines, it may also have beneficial effects on metabolism, adiposity and insulin sensitivity220.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [220] Consitt, L. A. & Clark, B. C. The vicious cycle of myostatin signaling in sarcopenic obesity: myostatin role in skeletal muscle growth, insulin signaling and implications for clinical trials. J. Frailty Aging 7, 21–27 (2018).

      Not checked in the free run.

  • May combine two claims.

    Premisenone given

    The bimagrumab trial population included participants with BMI up to 32 kg/m2, but there was no specific subanalysis for those with obesity.

    “While the study population included participants with BMI up to 32 kg/m2, there was no specific subanalysis for those with obesity.”
    Quote in the paperNot a substantial claim
53 of 53
  • The paper relies on this without support.

    Acute or chronic conditions magnify the impact of pathophysiological factors in older adults by increasing inflammation, limiting mobility, causing prolonged bed rest, altering medication pharmacokinetics and pharmacodynamics, and inducing nutrition impact symptoms.

    “These factors become even more important when older adults are affected by acute or chronic conditions, which can magnify the impact of these factors by further increasing inflammation, limiting mobility or leading to prolonged bed rest, altering medication pharmacokinetics and pharmacodynamics, and inducing nutrition impact symptoms.”
  • The paper relies on this without support.

    Loss of muscle mass is closely associated with ageing and typically begins in middle age and accelerates in later years.

    “The loss of muscle mass is closely associated with ageing and typically begins in middle age and accelerates in later years.”
  • The paper relies on this without support.

    The shift in muscle composition toward adipose infiltration contributes to decreased muscle quality and impaired muscle function.

    “This shift in composition contributes to decreased muscle ‘quality’ (that is, composition) and impaired muscle function.”
  • The paper relies on this without support.

    Insulin resistance impairs protein anabolism, directly affecting muscle fibre atrophy and promoting muscle catabolism.

    “Insulin resistance impairs protein anabolism, directly affecting muscle fibre atrophy and promoting muscle catabolism.”
  • The paper relies on this without support.

    Mitochondrial dysfunction and myosteatosis may further contribute to insulin resistance, which in turn impacts glucose metabolism and muscle protein synthesis.

    “Mitochondrial dysfunction and myosteatosis may further contribute to insulin resistance, which in turn, impacts glucose metabolism and muscle protein synthesis.”
  • The paper relies on this without support.

    Insulin stimulates uptake of glucose and amino acids into muscle cells, promoting protein synthesis and muscle growth.

    “Insulin stimulates the uptake of glucose and amino acids into muscle cells, promoting protein synthesis and muscle growth.”
  • The paper relies on this without support.

    Hormonal alterations further contribute to reduced muscle mass and adipose tissue deposition.

    “These hormonal alterations further contribute to reduced muscle mass and adipose tissue deposition.”
  • The paper relies on this without support.

    Increased insulin signalling in response to NO might help maintain muscle mass and function.

    “Increased insulin signalling in response to NO might help maintain muscle mass and function.”
  • The paper relies on this without support.

    NO is a potent vasodilator that regulates blood flow.

    “NO is also a potent vasodilator that regulates blood flow.”
  • The paper relies on this without support.

    The interplay between NO and insulin in maintaining mitochondrial health may contribute to muscle preservation.

    “The interplay between NO and insulin in maintaining mitochondrial health may contribute to muscle preservation.”
  • The paper relies on this without support.

    Hypocaloric diets can promote muscle loss by downregulating muscle protein synthesis and increasing proteolysis.

    “Hypocaloric diets can effectively reduce adipose tissue but may promote muscle loss by downregulating muscle protein synthesis and increasing proteolysis.”
  • The paper relies on this without support.

    The long-term sustainability of very-low-calorie diets is questionable because many individuals regain weight after stopping the diet.

    “Moreover, the sustainability of VLCDs is questionable, with many individuals regaining weight after transitioning off the diet.”
  • The paper relies on this without support.

    Recommendations based on current body weight may not be feasible in individuals with obesity, especially during a low-calorie diet.

    “Interestingly, recommendations based on current body weight may not be feasible in individuals with obesity, especially in the context of a low-calorie diet.”
  • The paper relies on this without support.

    Bariatric surgery leads to marked adipose tissue loss and relative improvements in physical function but also profound muscle mass losses.

    “Although bariatric surgery leads to marked adipose tissue loss with relative improvements in physical function, it also leads to profound muscle mass losses.”
  • The paper relies on this without support.

    Myosteatosis and ectopic adipose tissue deposition are at the heart of a vicious pro-inflammatory cycle in the pathophysiology of sarcopenic obesity.

    “Myosteatosis and ectopic adipose tissue deposition are extremely important as they are at the heart of a vicious, pro-inflammatory cycle observed in the pathophysiology of sarcopenic obesity.”
  • The paper relies on this without support.

    SARMs selectively target androgen receptors on muscle and bone tissues.

    “Selective androgen receptor modulators (SARMs) selectively target androgen receptors on muscle and bone tissues.”
  • The paper relies on this without support.

    Myostatin is a contributor to muscle–adipose tissue crosstalk.

    “myostatin is a contributor to muscle–adipose tissue crosstalk.”
  • The paper relies on this without support.

    Myostatin is a member of the TGFβ superfamily and inhibits skeletal muscle growth and development.

    “Myostatin is a member of the TGFβ superfamily and inhibits skeletal muscle growth and development.”
  • The paper relies on this without support.

    Individuals with sarcopenia have elevated levels of myostatin, which is also expressed in adipose tissue.

    “Individuals with sarcopenia have elevated levels of myostatin, which is also expressed in adipose tissue.”
  • The paper relies on this without support.

    The development and progression of sarcopenic obesity is influenced by an interplay of multiple factors including ageing, inflammation, and lifestyle.

    “The development and progression of this complex syndrome is influenced by an interplay of multiple factors including ageing, inflammation, lifestyle, among others.”
  • The paper relies on this without support.

    The clinical implications of sarcopenic obesity span from physical impairments to elevated morbidity and mortality rates.

    “The clinical implications of sarcopenic obesity span from physical impairments to elevated morbidity and mortality rates.”
21 of 21

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • The current definition of SO may not include adults exhibiting early signs of risk factors for SO, potentially delaying therapeutic or preventive interventions.

    “Specifically, the current definition of SO may not include adults exhibiting early signs of risk factors for SO, potentially delaying therapeutic or preventive interventions [19, 20, 21, 22].”

    From Sarcopenic Obesity Phenotype Index (SOP <i>i</i> ): A Population‐Based Study (2025) · cites this paper as [22]

    The Screening section (page not provided) says that BMI, waist circumference and some questionnaires can fail to identify people at risk of sarcopenic obesity. The Introduction (page not provided) stresses that early detection and intervention are crucial. The paper does not specifically say that the current definition excludes adults with early risk factors or that this exclusion delays intervention; its stated concern is with screening limitations. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • Protein plays a central role in the preservation of lean body mass and a high protein diet exceeding 0.8 g protein/kg bodyweight/day is the best option to mitigate reduction in lean body mass.

    “Protein plays a central role in the preservation of LBM and a high protein diet that exceeds the recommended 0.8 g protein/kg bodyweight/day is the best option to mitigate the reduction in LBM, with patients encouraged to increase their protein intake to maintain and recover muscle mass and function over the long term [51,59,73,74].”
  • Addressing physical inactivity through regular exercise can help preserve muscle mass and functionality.

    “In addition to higher protein intake, addressing physical inactivity through regular exercise can further help to preserve muscle mass and functionality [49,54,59,74,78].”

Cites

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1 of the 234 references couldn’t be matched to a known paper.

Cited by

Sorted by citations

Authors
Prado, C. M., Batsis, J. A., Donini, L. M., Gonzalez, M. C., & Siervo, M.
Affiliations
  • University of Alberta (CA)
  • University of North Carolina at Chapel Hill (US)
  • Sapienza University of Rome (IT)
  • Curtin University (AU)
Corresponding author
Prado, Carla M.
Venue
Nature Reviews Endocrinology
Published
2024-02-06
Volume
20
Issue
5
Pages
261-277
ISSN
  • 1759-5029 (ISSN-L)
  • 1759-5037
OpenAlex
W4391577587
Cited by
355
References
234
Citations by year
2026: 178 · 2025: 146 · 2024: 31
FWCI
20.17
Type
journal article
Language
en
Open access
Locations
  • Nature Reviews Endocrinology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • IRIS Research product catalog (Sapienza University of Rome) (submittedVersion)
Funders
  • National Institute on Aging (R01AG077163)
  • National Institute of Diabetes and Digestive and Kidney Diseases (P30DK056350)
Topics
  • Health Sciences › Medicine › Physiology › Nutrition and Health in Aging
  • Health Sciences › Medicine › Physiology › Body Composition Measurement Techniques
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
Keywords
sarcopenic obesity, older adults, adipose tissue, geriatric syndromes, pathogenesis, inflammation, oxidative stress, hormonal changes, exercise therapy, nutritional therapy, pharmacotherapy, precision medicine, mortality, comorbidities
MeSH terms
Aged, Body Composition, Humans, Nutritional Status, Obesity, Exercise, Comorbidity, Sarcopenia

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Claims read by deepseek-v4.1-flash under definition version 3 (extract-v3) on 2026-10-07.

Classified by jev-1.13-20260917 (gold-guideline-v0.2) on 2026-10-07.

Statistics and arithmetic are recomputed, not judged.

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